Sen. Lindsey Graham (R-SC) warned on Sunday that militants in Iraq and Syria would attack the U.S. mainland if President Barack Obama did not immediately take military action to stop them.

"I think of an American city in flames because of the terrorists' ability to operate in Syria and Iraq," Graham told Fox News host Chris Wallace. "Mr. President, you have never once spoke directly to the America people about the threat we face from being attacked from Syria, now Iraq. What is your strategy to stop these people from attacking the homeland?"

The senior senator from South Carolina recommended a "sustained air campaign in Syria and Iraq."

"Are you saying we should go back to war in Iraq?" Wallace wondered.

"I'm saying that Iraq and Syria combined represent a direct threat to our homeland," he explained. "His responsibility as president is to defend this nation. If he does not go on the offensive against ISIS, ISIL -- whatever you want to call these guys -- they are coming here!"

"It is about our homeland, and if we get attacked because he has no strategy to protect us then he will have committed a blunder for the ages."

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